Apparatus for evaporating solvents from smokeless powder.



No. 718,484. I PATENTED JAN. 13, 1903.

I P. F. A. LIEDBEGK. H APPARATUS FOR EVAPORATING SOLVENTS FROM SMOKELESSPOWDER.

'APPLiOATION FILED JUNE 1, 1899.

N0 MODEL.

WITNESSES. INVENTOR a WM Maw @QYAWQ A TTORNE Y8 mammals PETERS norno'raumq. wmmcmn'l 1 cl PER FREDRIK ALARIK LIEDBEGK, OF STOCKHOLM,SWEDEN.

APPARATUS FOR EVAPORATING SOLVENTS FROM S MOKELESS POWDER.

SPECIFICATION formingpart of Letters Patent No. 718,484, dated January13, 1903.

Application filed June 1, 1899. Serial No. 719,035. (No model.)

To all whom 56 may concern:

Be it known that I, BER FREDRIK ALARIK LIEDBEOK, engineer, a subject ofthe King of Sweden ano. Norway, and a resident of Stockholm, in theKingdom of Sweden, have invented certain-new and useful Improvements inApparatus for Evaporating the Solvent in the Manufacture of SmokelessPowder, of which the following is a specification, reference being hadtherein to the accompanying drawlugs.

This invention relates to an apparatus to be employed in the manufacturein known manner of either homogeneous or progressive smokeless powderfrom solutions, and the special task to be performed by it is to producethe desired kind of powder by the evaporation of the solvent from thesolution spread out in thin layers superposed on one another.

In the accompanying drawings such an apparatus is shown in Figure 1 in avertical section on line a b of Fig. 2, and in Fig. 2 in a cross-sectionon line 0 d of Fig. 1.

The apparatus consists of an opendrum A, adapted to be rotated at greatvelocity and here shown in ahorizontal position, said drum being fixedto one end of a shaft B, journaled in a frame and arranged to be rotatedby some known means. The drum is inclosed in a casing O D surroundingthe drum, and for easy taking apart and putting together being suitablymade in two parts, of which the part D or the cover can be inserted inthe interior of the drum and by means of readily-detachable boltfastenings or eccentrics secured tightly to the edge of the other part.The walls of the two parts of the easing are arranged for heating bysteam, hot water, or the like-for instance, by making them hollow, asshown in the drawings, and conducting the'heating agent into thecavities by means of pipes E and F. The space within the casing isconnected by a pipe I or the like with an apparatus for the introductionof heated air. The evaporation may alternately take place in a vacuum,in which case the apparatus is connected by means of a pipe G with acondenser,from which the air is evacuated and from which the accumulatedcon- .densed matter can be removed in some manner or other.

The air by which-the solvent is absorbed is conducted by a pipe G to anapparatus for the recovery of the solvent by condensation or absorption.Into the space within the casing 0 D, either inside or outside of thecylindrical wall of drum A, is inserted, through an air-tight joint, apipe H, which can be shifted to and fro along the drum and is providedat the end with a suitable nozzle through which the solution introducedin said pipe is ejected at a suitable pressure onto the surface of thedrum. The solution ejected forms rings or spirals on the surface of thedrum, and these form together a firm and uniform layer which, togetherwith other superposed layers, forms a course. By the combined infiuenceof spreading the solution out in extremely-thin layers, heating, andcreating air-circulation or a vacuum the solvent has time to evaporatecompletely from one layer before a fresh one is superposed. The course.

of powder formed or courses, if several differentkinds are superposed onone another, constitutes or constitute a firm cylinder which when cutopen can be readily removed from the surface of the drum on detachingthe cover D.

Having now described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. In an apparatus for evaporating the solvent in the manufacture ofsmokeless powder, the combination with a closed casing having hollowwalls arranged to be heated by steam or the like, of a cylindrical drumhaving its axis in a horizontal plane and rotating freely within saidcasing, and means for spreading out the solution on the said rotarydrum, substantially as described.

2. In an apparatus for evaporating the solvent in the manufacture ofsmokeless powder, the combination of the driving-shaft, the hollowcylindrical drum having one end open and a closed wall secured to thesaid shaft, the casing, inclosing the said drum and having one wallextending into the drum and substantially concentric with the circularwall of the same, the outer and inner walls of said casing being hollowand arranged to be heated by steam or the like, means for feeding thesolvent to the said drum, and the air inlet and outlet pipes leading toand from the said casing, substantially as described.

3. In combination, the driving-shaft, the hollow cylindrical drum havingone end open and having an end wall provided with an inwardly-curvingcentral portion, a two-part casing having hollow Walls concentric withthe circular wall of the drum, said innerpart of the casing having aninwardly-curving Wall parallel with the end Wall of the drum,

an air-inlet pipe connecting with the center of said casing-Wall, and adelivery-pipe from the upper part of the casing, and a pipe leading tothe lower part of the casing Within the Wall of the drum for feeding thesolvent, substantially as described.

In Witness whereof I have hereunto signed my name in the presence of twosubscribing Witnesses.

PER FREDRIK ALARIK LIEDBECK.

Witnesses:

ERNST SVANQUIST, E. HERMANSSON.

